The National Hurricane Center is tracking a tropical wave in the central Atlantic which is moving quickly toward the Caribbean. There also is a non-tropical system over the northwestern Atlantic — well away from Florida — that may develop into a tropical or subtropical storm over the next several days, according to AccuWeather.

With Hurricane Melissa bearing down on Jamaica, airlines have rolled out flexible rebooking policies and canceled select flights to affected airports.

The National Hurricane Center (NHC) is monitoring a tropical wave for the possibility of tropical development in the Atlantic Ocean.

Today, Today, several developments occurred. Melissa changed into hurricane, before turning into a Category 5 hurricane. Then, it weakened to a Category 4 hurricane and eventually became a Category 3 hurricane before being downgraded to a Category 3 hurricane with sustained winds of 125 mph.

Melissa is now centered off the northern coast of Jamaica after barreling ashore as one of the strongest Atlantic hurricanes in history. Follow for live updates.

Scientists have debated adding a "Category 6" to the Saffir-Simpson scale for storms with winds over 192 mph. The already dangerously powerful Category 5 hurricane Melissa surged up to 180 mph maximum sustained winds with gusts over 210 mph Tuesday morning,